Free-breathing 3D steady-state free precession coronary magnetic resonance angiography: Comparison of diaphragm and cardiac fat navigators

Thanh D. Nguyen, Pascal Spincemaille, Matthew D. Cham, Jonathan W. Weinsaft, Martin R. Prince, Yi Wang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Purpose: To compare the performance of the conventional diaphragm navigator (DNAV) and the recently developed cardiac fat navigator (FatNAV) in suppressing respiration-induced cardiac motion in free-breathing 3D balanced steady-state free precession coronary MRA (SSFP CMRA). Materials and Methods: In 16 healthy volunteers the right coronary artery (RCA) was imaged at 1.5T using a navigator-gated 3D SSFP CMRA sequence. DNAV and FatNAV gating were performed in random order. Image quality difference was scored by three experienced readers blinded to the gating technique. Blood signal-to-noise ratio (SNR), blood-to-myocardium contrast-to-noise ratio (CNR), and navigator efficiency were calculated. Results: Diagnostically interpretable CMRA was obtained successfully in all 16 subjects with FatNAV gating (0% failure rate) and only 14 subjects with DNAV gating (12% failure rate). Compared to DNAV gating, FatNAV gating provided similar SNR and CNR, better image quality (P < 0.01), and 28% improvement in navigator efficiency (P = 0.002). Conclusion: FatNAV gating provides more effective motion suppression and better image quality than DNAV gating for free-breathing 3D SSFP CMRA of the RCA in healthy subjects.

Original languageEnglish
Pages (from-to)509-514
Number of pages6
JournalJournal of Magnetic Resonance Imaging
Volume28
Issue number2
DOIs
StatePublished - Aug 2008
Externally publishedYes

Keywords

  • Cardiac fat navigator
  • Coronary magnetic resonance angiography
  • Diaphragm navigator
  • Motion artifacts
  • Steady-state free precession

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